postfix.cpp

来自「c语言教程源码」· C++ 代码 · 共 30 行

//这个程序在本书所带软盘中，文件名为POSTFIX.CPP
//这个程序将演示后缀增值、减值运算在表达式中的应用。

#include <iostream.h>

void main(void)
 {
	int num1, num2,num3;
	int i = 1, j = 2, k = 3;
	int count = 4, x = 10, num = 20;
	int ans;

	num1 = 10; num2 = 5;
	num3 = num1++ / num2--;  				//执行时变量num1的值不变
	cout << "num1: " << num1 << "num2: " << num2 << endl;
	cout << "num1++ / num2--: " << num3 << endl;
	cout << "num1: " << num1 << "num2: " << num2 << endl;

	num3 = num1++ * 5 - num2-- * 3;
	cout << "num1++ * 5 - num2-- * 3: " << num3 << endl;
	cout << "num1: " << num1 << "num2: " << num2 << endl;

	ans = count++ >= 5 && x-- != num%3;		//我们讨论过的例子
	cout << "cout++ >= 5 && x-- != num % 3: " << ans << endl;

	ans = 4;
	ans += i++ * j - k--;					//我们讨论过的例子
	cout << "ans += i++ * j - k--: " << ans << endl;
	cout << "i: " << i << "  k: " << k << endl;
}